<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 所有标签设置 */
    * {
    color: red;
    }
    </style>
</head>
<body>
    <p>p标签</p>
    <div>div标签</div>
    <h2>标签</h2>
</body>
</html>